How to export emails from Outlook OST file to PST for Mac OS? Install and run OST Converter for Mac Tool on any Macintosh computer and quickly export emails from Outlook OST file to PST with all details. This app has a simple and direct conversion process to export emails from Outlook OST file to PST file in bulk without missing any data. A free trial edition of the Mac OST to PST Converter is also available for user testing and permits them to convert the first 25 items from each selected OST folder to PST format with attachments and other info.